Bromoform → 5-bromo-1-(2-chloro-6-fluoro-4-(trifluoromethyl)phenyl)-4-(trifluoromethylsulfinyl)-1H-pyrazole-3-carbonitrile

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-amino-1-(2-chloro-6-fluoro-4-(trifluoromethyl)phenyl)-4-(trifluoromethylsulfinyl)-1H-pyrazole-3-carbonitrile (130 g, 310.3 mmol, 1.00 eq.) in CHBr3 (520 mL) was added dropwise isoamyl nitrite (109 g, 930.8 mmol, 3.00 eq.) at 55˜60° C. After all the isoamyl nitrite was added, the solution was stirred at 60° C. for 30 min. Then the mixture was concentrated under vacuum to give red solid. The solid was recrystallized with isopropyl alcohol to give 5-bromo-1-(2-chloro-6-fluoro-4-(trifluoromethyl)phenyl)-4-(trifluoromethylsulfinyl)-1H-pyrazole-3-carbonitrile (110 g, 73%) as yellow solid.

Provenance & Evidence